Re: Orange 50th

Here's a little clearer picture. The site I found it on also has some description, which I'm not smart enough to understand, but probably answers my question above - what do the knobs do?
Here's the text:
"Circa 1972 Orange amps are referred to as ""Pics Only"" as they feature only the hieroglyphs and no text on the controls. These amps had the Baxandall EQ first in the circuitry, then Gain, then the phase inverter. Adds Adrian Emsley, ""What's more, the DC-coupled 'concertina' phase inverter used in the first Orange amps was changed to a capacitor-coupled version in the 'Pics Only' models."" This capacitor-coupled type of phase inverter drives the output valves harder, and this creates a more overdriven and crunchy sound. In this way, the Pics Only was the start of the new sound that everybody associates with Orange."
These were the amps that excited me in 1976 when I moved to Boston at age 17 and started going out to clubs.
From memory I believe these were available in 80 and 120 watt versions. Anyone know more?
I stayed in Boston until 1981, by then they were available on the used market, but still out of my price range.
I believe these are more commonly referred to as the "Graphics" models than "Pics Only" these days, perhaps even by Orange themselves.
The "mountains" graphic over the two input jacks on the right are the send and receive for the outboard echo unit, which Orange also made.